The twin developments came even as the crisis seemed to be easing or at least stabilizing, by some measures, in New York and parts of Europe, though health officials warned people at nearly every turn not to let their guard down. After 76 days, China finally lifted the lockdown on Wuhan, the city of 11 million where the outbreak began.

COVID-19's toll in New York City is now more than 1,000 deaths higher than that of the deadliest terror attack on U.S. soil, which killed 2,753 people in the city and 2,977 overall, when hijacked planes slammed into the twin towers, the Pentagon and a Pennsylvania field on Sept. 11, 2001.

New York state recorded 731 new coronavirus deaths, its biggest one-day jump yet, for a statewide toll of nearly 5,500, Gov. Andrew Cuomo said.

"A lot of pain again today for many New Yorkers," he said.

But in an encouraging sign, the governor said hospital admissions and the number of those receiving breathing tubes are dropping, indicating that social distancing measures are succeeding.

And alarming as the one-day increase in deaths might sound, the governor said that's a "lagging indicator," reflecting people who had been hospitalized before this week. Over the past several days, in fact, the number of deaths in New York appeared to be leveling off.

"You see that plateauing — that's because of what we are doing. If we don't do what we are doing, that is a much different curve," Cuomo said. "So social distancing is working."

Still, 6-foot (2-meter) social distancing has become impossible at times in the city's subway system.

With service drastically reduced, essential workers are encountering some busy trains as they head to their jobs. Photos taken in Brooklyn showed riders sitting or standing within inches of each other, some not wearing face masks.

Across the U.S., the death toll neared 13,000, with close to 400,000 confirmed infections. Some of the deadliest hot spots were Detroit, New Orleans and the New York metropolitan area, which includes parts of Long Island, New Jersey and Connecticut. New Jersey recorded over 1,200 dead, most of them in the northern counties where many residents commute into New York City.

In London, the 55-year-old Johnson was in stable condition and conscious at a hospital, where he was receiving oxygen but was not on a ventilator, officials said. Foreign Secretary Dominic Raab was designated to run the country in the meantime.

"For all of us in Cabinet, he is not just our boss. He's also a colleague, and he's also our friend," Raab said. "And I'm confident he'll pull through, because if there's one thing I know about this prime minister, he's a fighter."

Deaths in Britain reached nearly 6,200, after a one-day increase of almost 800.

President Donald Trump trained his anger at the World Health Organization and threatened to freeze U.S. funding for it, saying the international group had "missed the call" on the pandemic and that it was "very China-centric."

Throughout his presidency, Trump has voiced skepticism toward many international organizations and has repeatedly heaped scorn on the WHO. In its most recent budget proposal in February, his administration called for slashing the U.S. contribution to the WHO from an estimated $122.6 million to $57.9 million.

Trump suggested the WHO had gone along with Beijing's efforts months ago to minimize the severity of the outbreak. The WHO has praised China for its transparency on the virus, even though some public health experts regard the country's figures with suspicion.

"They should have known and they probably did know," Trump said of WHO officials.

On Wall Street, a strong rally propelled by signs that the outbreak may be leveling off in some hard-hit parts of the world evaporated after the price of crude oil suddenly fell. Stocks ended the day slightly lower.

Elsewhere, Chinese authorities ended the lockdown on Wuhan, and tens of thousands of residents traveled in and out of the sprawling industrial city. Residents must use a cellphone app showing that they are healthy and have not been in recent contact with anyone confirmed to have the virus.

China, which officially recorded more than 82,000 infections and over 3,300 deaths, reported 62 new cases — 59 of them brought from outside the country — and two additional deaths Wednesday.

In Japan, Prime Minister Shinzo Abe declared a monthlong state of emergency in Tokyo and six other prefectures because of a spike of infections in the country with the world's oldest population. The order will close night entertainment.

"My lifestyle will change. These are difficult times" said Yoshiyuki Kataoka, 44, a nightlife industry worker. "Maybe I'll become a recluse."

In some European hot spots, as in New York, authorities saw signs that the outbreak was turning a corner, based on slowdowns in new deaths and hospitalizations.

In Spain, new deaths Tuesday rose to 743 and infections climbed by 5,400 after five days of declines, but the increases were believed to reflect a weekend backlog. Authorities said they were confident in the downward trend.

In Italy, with over 16,500 deaths, authorities appealed to people ahead of Easter weekend not to lower their guard and to abide by a lockdown now in its fifth week, even as new cases dropped to a level not seen since the early weeks of the outbreak.

In France, the number of dead passed the bleak milestone of 10,000, climbing to more than 10,300, said Jerome Salomon, national health director.

"We are in the epidemic's ascendant stage," he said. "We have not yet reached the peak." But he offered a glimpse of hope, saying the virus rate is "slowing a little."

In the U.S., Surgeon General Jerome Adams said that if Americans continue to practice social distancing for the rest of April, "we will be able to get back to some sense of normalcy."

One lockdown exception was Wisconsin, which asked hundreds of thousands of voters to ignore a stay-at-home order to participate in its presidential primary Tuesday.

Lines were particularly long in Milwaukee, the state's largest city and a Democratic stronghold, where just five of 180 traditional polling places were open. Many voters statewide did not wear facial coverings.

Worldwide, about 1.4 million people have been confirmed infected and over 80,000 have died, according to Johns Hopkins University. The true numbers are almost certainly much higher, because of limited testing, different rules for counting the dead and deliberate underreporting by some governments.

For most people, the virus causes mild to moderate symptoms such as fever and cough. But for some, especially older adults and the infirm, it can cause pneumonia. About 300,000 people have recovered worldwide, by Johns Hopkins' count.

One of the main models on the outbreak, from the University of Washington, is projecting about 82,000 U.S. deaths through early August, with the highest number on April 16.